To analyse receivers’ reliability, we plot the BER performances of our proposed receiver versus the linear receivers based on PIC [1]} and MMSE [2]} schemes; Bayesian learning receivers based on EP [3]}, [4]} and AMP[5]} schemes; an optimal ML receiver [6]} for different system configurations. The same modulation scheme and number of channel realisation as in Section V are used. Note also that we perform trial and error process to search for the optimal learning parameters for EP and AMP off-line. We found that the optimal learning parameters in the EP and AMP receivers are \(\beta = 0.9 \)  and \(0.2\) , respectively.
